Casing sealing shoe or boot



y 1, 1953 J. L. STRICKLER CASING SEALING SHOE OR BOOT Filed Oct. 15, 1951 allYlil Joseph Strick/ei INVENTOR.

BY w

W FML Patented July 21, 1953 "UNITED "STATES PAT N OFFICE Application October 15, 1951, Serial No. 251,355

1 Claim.

The present invention relates to new and useful improvements in casing sealing shoes or boots for use particularly in relatively shallow oil wells where it is frequently necessary to enlarge the bottom of the hole by shooting, and wherein considerable difficulty may be encountered in permanentlysealing the casing in place after the shot.

The primary object of the present invention is to provide novel means for forcing cement under pressure into the usual space between the casing and the wall of the bore hole.

Other objects of the invention are to provide a casing sealing shoe or boot of the aforementioned character which will be comparatively simple in construction, strong, durable, highly efficient and reliable in use, compact and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawing wherein like characters of reference designate corresponding parts throughout the several views, and wherein:

Figure 1 is a vertical sectional view, showing a casing sealing shoe or boot embodying the present invention in position in a well;

Figure 2 is a view in vertical section through the device; and

Figure 3 is a view in transverse section, taken substantially on the line 3-3 of Figure 2.

Referring now to the drawing in detail, it will be seen that the embodiment of the invention whichhas been illustrated comprises a nipple t which is interposed through the medium of coupling sleeves i at the desired point in an oil well casing 8 above the shot hole 9 of the well or bore hole IE3; Mounted in the nipple 6 is a hollow body'll of aluminum, cast iron or.

other suitable metal. The body ll comprises apartition I2 providing intake and discharge chambers 13 and I l, respectively, in said body. The chambers 53 and M communicate with each other through a port I in the partition I2. A swinging check valve [6 in the chamber It controls the port E5. Access may be had to the chamber i l and the check valve It through a removable plug I? which is threadedly mounted in the upper portion of the body H.

A threaded conduit [8 of cast iron or other suitable material connects one end of the body H to the nipple 6, through which conduit cement flows from the chamber I4 to the exterior of said nipple. This is shown to advantage in 2 Figure 1 of the drawing. The other end of the body I I may, if desired, be secured by light welding to the casing 8. Also, in the embodiment shown, the entire body H is encased in concrete, as at l9.

A tubing 20 extends downwardly in the casing 8 and is connected to the body llin communication with the chamber 13. The tubing 2!] is joined to the body I! by a left hand thread connection 2|. The tubing 29 extends to a suitable cement pump (not shown).

It is thought that the operation of the invention will be readily apparent from a consideration of the foregoing. Briefly, the casing 8 is pulled and the well is shot. The assembly comprising the elements 6, l, H, I8, 20, etc., is then interposed in the casing at the desired point, after which said casing is lowered into the well; Cement under pressure from asuitable source. of supply is then forced through the tubing 20; into the chamber [3 of the body II. From the: chamber I 3 the cement flows through the port. It past the'check valve it into the chamber l4, thence through the conduit 18 into the space: between the casing 8 and the bore hole [0. Aftera suincient quantity of cement has thus been. deposited in the bore hole the tubing 20 is unscrewed from the body II and pulled out of the well. The cement that has been deposited in the bore hole is then permitted to set, thus firmly securing the casing in position. Then, the usual tools are lowered into the well for breaking the concrete l9 and the conduit [8 away from the nipple 6, the parts falling into the usual pocket 22 below the shot hole 9'.

It is believed that the many advantages of a casing sealing boot or shoe constructed in accordance with the present invention will be readily understood and although a preferred embodiment of the device is as illustrated and described, it is to be understood that changes and the details of construction may be resorted to which will fall within the scope of the invention as claimed.

Having described the claimed as new is:

Means for sealing a well casing in a bore hole comprising, a nipple interposed in the casing, an elongated, hollow body mounted diametrically in said nipple, a transverse, vertical partition in the body defining inlet and outlet chambers. said partition having a port therein for the passage of cement from the inlet to the outlet chamber, a gravity closed check valve hingedly mounted on the partition for preventing retroinvention, what is 3 grade flow of the cement through the port, a References Cited in the file of this patent detachable supply tubing threadedly connected to one end of the body and communicating with UNITED STATES PATENTS the inlet chamber, a breakable discharge conduit threadedly connecting the other end of the 5 Number m Date body to the nipple in spaced relation thereto for 1391678 FrFmCOIS Sept 1921 supporting said body therein, said conduit com- 1411057 Mmer 1922 municating with the outlet chamber, and ce- 1491986 Greene 1924 ment in the nipple encasing the body and the 1'830851 Murphy 1931 conduit, said one end of said body abutting the 0 2173034 Armentmut at Sept 1939 nipple.

JOSEPH L. STRICICLER. 

